* Add eCMR classes based on the UN/CEFACT standard, but with adjustments and custom fields
* Add a documentation showing each field and where the UN/CEFACT standard is used, adjusted or extended by custom fields
* Enable a ci pipeline for the data model

Co-authored-by:

* Björn Krämer bjoern.kraemer@iml.fraunhofer.de
* Niklas Burczyk niklas.burczyk@iml.fraunhofer.de
* Till-Philipp Patron till-philipp.patron@iml.fraunhofer.de
* Marcus Schröer Marcus.Schroeer@iml.fraunhofer.de